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Ryuga Bonsai Tools Quality Testing




As a consumer the number 1 things on everybody mind is " how good is the quality " or "wonder if this will last "


At Bonsai-En we try to stock items for everyone from beginner to Pro. Ryuga fits right in the middle of those 2 categories in terms of Quality and Price. This article will show you the Testing process that their tools under go so you can have piece of mind when buying them.


Ryuga Tools are made in China but they are made to Japanese Quality Standards.


Continue reading below to find out more. This article was written by the good people at Ryuga to show the Quality of their tool production.


Quality Control Method

Improved Quality Control Method One of the most common problems with bonsai tools is breakages, or at least an open gap on the blades. As all bonsai tools are hand-made, strict quality control is a must on each production step to assure a consistent high quality standard of the tools. RYUGA is applying a very strict quality control process as standard requested by our Japanese OEM partner, and RYUGA is the only bonsai tools that provide a two-year free replacement guarantee for all products. RYUGA from time to time doing analysis on the quality of our tools in all aspects and do improvement either on the material, production process or the quality control procedure as well; and this is one of our new improved quality control procedures on RYUGA cutters.


  The Cause of Breakages


Normally the broken section has occurred between the cutting head and the handle, and this is due to the crystal structure of iron in the broken section which is called “Austenite residue” that still remains in the broken area. Actually in a technical point, this area should not remain such rough “Austenite residue”, as “Austenite residue” has very bad deform-ability. In other words, if the iron of the cutting head is very hard, “Austenite residue” could possibly cause weakness. We call this as being“Failure caused by Brittle”.  Another reason is in a heating treatment process for the “functional working part” to turn the iron form into high appropriate mechanical properties. This process should be done only limited on the “product working area” (not on the handles) as illustrated below.




Quality Control to Avoid Breaking Problems


a. Initial check on the “raw pieces”. We do 100% hardness checks through the air pressing machine as below. Only the pieces that passed this test will be used for next production process.


Standard of air pressing: 60psi; 5Kg/cm2

b. Based on our Japanese OEM partner’s standard request, we are using a special formula alloy steel specifically used for bonsai tools. Our stainless steel material used is 3CR13 to 4CR13 with hardness reach to HRC 55+-2. The hardness of this alloy steel for bonsai tools is around 2 times than the normal steel used for garden tools. 

Generally speaking, the higher the hardness is, the more brittle the alloy steel will be. Therefore, after initial air pressing hardness check, we still do a random check on some pieces to assure no “Austenite residue” inside by breaking the pieces.




c. After assembling the raw pieces, we conduct second air pressing testing to check if any cracks occurred between joint areas after adjusting the balance between two cutting heads. This is also to check the hardness and flexibility of the handles; the handles should not bent after the test.




d. After polishing the blades, we will conduct the final functional test by cutting a 15mm dry wooden stick to make sure the hardness and sharpness of the product before packing and shipment to the customers. Each tool must have made a clean cut on the dry wooden stick in one pressing without damaging the blades as to pass the final quality control.



Standard of air pressing: 50psi; 4Kg/cm2. (Normally, 30psi; 2.5kg/cm2 of pressing power is enough to make the clean cut

On the initial production process of bonsai tools, the metal pieces should be properly forged by hand before casted into the shape. The forging process is the most crucial stage to ensure the density of the material, which later on confirms the final tool quality.

Another crucial stage is on the cold oil process to harden the blade. Any pin holes due to improper forging process will severely affect the blade quality, which can cause breakages. The problem is that there is no technique to ensure if the forging process has been done properly on the entire piece before the cold oil process; so a good quality control method is needed to confirm the final quality.

For our "Ryuga" tools, we had established our high QC procedure to ensure our quality, both the consistency of material quality as well as the final functional quality. After the cold oil treatment, each piece of our tool will go through the pressing test to ensure the blade quality as shown on below picture. Any improper forging process will never passed the process, the thinner parts will break....




The similar strict QC procedures are conducted on all "Ryuga" different model tools including our scissors before shipment. We give 2 years free replacement guarantee to all of our tools.




I hope this article has helped shed some light on the Quality of Ryuga Tools.


Ryuga Tools are fantastically priced and as you can see are very good quality.

Most ryuga tools also come with a free leather protective pouch.


To purchase your very own ryuga tools visit www.Bonsai-en.shop


Happy Shopping!

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